错误示范: var projectSubmitInfos = (from project in db.T_PM_Project join member in db.T_PM_Member on project.ProjectID equals member.ProjectID join user in db.T_Sys_UserInfo on member.UserID equals user.UserID join task in taskSummary on new {member.User
1.第一种方式 if(partsSalesOrderTypes.GroupBy(entity => new { entity.Name, entity.Code }).Any(array => array.Count() > )) { /*违反多字段唯一时,提示信息处理*/ return; } .第二种方式 var groupPrice = from price in this.PartsSpecialTreatyPrices group price by new { price.Dea
想要List结果反复 的数据非常easy.仅仅要.Dinstinct()就好了 可是假设想要依据某个字段去除反复的数据,上面的方法就帮不上忙了.我们须要重写一个方法.直接上样例吧 [Serializable] public class HomePageUserModel { public int UserID { get; set; } public string TitleUserName { get; set; } public string ShowUserName { get; set;
Group在SQL经常使用,通常是对一个字段或者多个字段分组,求其总和,均值等. Linq中的Groupby方法也有这种功能.具体实现看代码: 假设有如下的一个数据集: public class StudentScore { public int ID { set; get; } public string Name { set; get; } public string Course { set; get; } public int Score { set; get; } public str
http://blog.csdn.net/pan_junbiao/article/details/7015633 (LINQ To SQL 语法及实例大全) 代码 Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->using System; using System.Collections.Generic; using System.Linq; u